Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7148a4d241f4d9…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 22:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30840a92bd6d702605a297a2d5a0aec3 SHA-1: 04587fc275c27a6d464e08931bfcbd3398c166bd SHA-256: be7148a4d241f4d96e11d07e1574f828638f7e5032ae5251e154d676b309bdd6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains embedded JavaScript and multiple links to external PDF files, many hosted on disposable domains or compromised WordPress sites. Heuristics indicate it's a link farm and a lure for credential harvesting, specifically targeting MFA or one-time codes. ClamAV also detected it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nisahanpin.com/calisma2/files/uploads/nobeliroj.pdf In PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/ae0f12a0e779bd03de82c148bfbe327c/69759695089.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/5646258063.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/tapeziwigi.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/57028644904.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/39010172621.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/14827567010.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/nagarebew.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/xaxotasutaruv.pdfIn PDF document text
    • http://markone-tools.com/upload/files/dawinopunanuvolesunij.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4676c3cbc4785447138656df8246d42e/raredebenipexemetanod.pdfIn PDF document text
    • https://svezadjecu.me/userfiles/file/37967670153.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/xarutuvit.pdfIn PDF document text
    • https://ccar.host168.com/data/fckeditor/files/78486739133.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/70852434323.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442c72dcfed---sujineraxo.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/lebetutotim.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/30325959265.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/zumaxigebozufa.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/25593102861.pdfIn PDF document text
    • http://serting.eu/userfiles/files/xowujafedekos.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142606d601c0---kimesepixaginavat.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/3cfdc060e2b23e8e215df640f3f31f4d/pumonivuwezusogokevul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=elements+of+style+free+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AF 10500 bytes
SHA-256: 6336c22672958616e00b426b49cc04b3874d0dbcf55bda79712bda25657e7b9d
font_01_sfnt_off0000ca8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8E 14868 bytes
SHA-256: bcd5fa60c7d3f327d8640c71ea5fa955bb391bdad4abcab7465c9cf15b74a392
font_02_sfnt_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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